Mapping Water Balance around Lake Turkana

Group 6 Members

1. Shamsuddin Musa Ahmed

2. Anwar Assefa Adem

3. Francis Oloo

4. Abias Maniragaba

5. Anthelem Iragena

6. Yohannes Negussie

7. Fitsume Teshome Wolkeba

Problem:• The case study area is vulnerable to extreme

climatic conditions [drought and floods]

• Droughts reduce the water that is available to the community livelihood generation in the area

• To assess the spatial and temporal variability of water balance around Turkana.

Objective:

Study area

• L. Turkana, a desert lake shared by Ethiopia and Kenya

• Lake Turkana is in an arid area

• The average annual rainfall is 250mm

• Main livelihood generation activities are fishing, pastoralism

• Population: 300,000

Data Source Spatial Resolution Temporal Resolution

Precipitation AFDM 2.5km (2018) Monthly

Runoff AFDM 2.5km (2018) Daily

Evapotranspiration AFDM 2.5km (2018) Daily

Data download &

Preprocessing

Water Balance Estimation

Mapping

Data

Workflow

Analysis was done in R & ArcGIS

Precipitation variability in 2018

Variation in runoff (2018)

Evapotranspiration (2018)

Water balance in 2018

• Preliminary results highlight the potential cold and hot spots of water deficiency

• Cold spots can be combined with other variables to map ground water potential areas

• The hotspots highlight areas that may need interventions.

Way forward• Results demonstrate the potential benefits of large

scale earth observation data in assessing the spatial and temporal of water budgets

• This kind of analysis can contribute to understanding ground water potential

Limitations• Spatial resolution of the data is course, limiting fine

scaled analysis

• AFDM platform does not allow for data to be retrieved via known extents, making it difficult to replicate analysis